Most likely

Anna is an ace detective. She has helped everyone from Scotland yard to the secret service. One day she got the burn notice and was left at the curb. A former criminal turns up at her home with a proposal. She can find criminals again but she will be working for an autonomous company that might occasionally have shady deals she must look the other way. Putting aside one of the morals her now-deceased mentor had drummed into her. She was delighted at the prospect of finding the monster who killed her best friend and the reason she has no recollection of the past beyond waking up at Boston General eight years ago. Five years into the deal she hasn't lost sleep over her decision. Now she meets men and women she has helped or arrested since she rolled up her sleeve. She is nowhere near her answers but she is content knowing that the worst are behind bars where they belong.